SHEBOYGAN, Wis.—Police in Wisconsin have at least two devices that secretly track cellphone locations in real time to target suspects or missing persons, according to a published report.

The technology mines data from hundreds or thousands of unsuspecting people nearby. The devices are known by the trade name Stingray, Gannett Wisconsin Media reported this weekend ( http://shebpr.es/1iONooo). The report said the devices raise concerns for privacy advocates because law enforcement officials won’t say how often they use them, how the data is used or kept, or whether they get a warrant from a judge before using the technology.

Law enforcement officials declined interview requests and redacted references to the Stingray in public records requested by the Gannett Wisconsin Media Investigative Team. But documents show that the devices have been used for years by both the Wisconsin Department of Justice and the Milwaukee Police Department.

The DOJ device has been in use since at least 2006 and is loaned to federal, state and local agencies for use throughout Wisconsin and neighboring states, according to the report.

The Wisconsin Supreme Court is considering whether a warrant to use a Stingray in a Milwaukee murder case was valid.

“We have very powerful technology that has very important consequences for our privacy, but we don’t have the kind of transparency necessary to kind of understand what the contours of the issue are,” said Byron Lichstein, a defense attorney arguing case. “Even if the targeted information is narrow, the amount and private nature of the information that can be collected is pretty striking.”

A suitcase-sized Stingray masquerades as a cell tower to trick cellphones into connecting to it. It can show phones within a mile or more, depending on the terrain. Records show the DOJ’s Stingray cost more than $150,000 and that the DOJ and Milwaukee police both purchased upgrade packages that topped $100,000.

Specifics on the Stingray are hard to come by since the manufacturer, Florida-based Harris Corp., won’t discuss its technology and requires customers to sign nondisclosure agreements. The devices are not known to intercept the content of calls or text messages, the report said. But they capture location details and, possibly, the numbers with which a given phone is communicating, according to court records and published reports.

“It’s hard to know how all the information is going to be used once it’s collected, so that’s why you need limits on what can and can’t be collected,” said Lichstein, a professor at the University of Wisconsin Law School.

The Wisconsin Legislature passed a bill in February requiring warrants in order to use cellphone tracking technology in most cases. The legislation, which has yet to be signed by Gov. Scott Walker, would place fewer limits on cellphone tracking than state law requires for traditional search warrants.

Police in other states often use the devices without warrants, including more than 200 times in Florida since 2010, according to court testimony.

As you comment, please be respectful of other commenters and other viewpoints. Our goal with article comments is to provide a space for civil, informative and constructive conversations. We reserve the right to remove any comment we deem to be defamatory, rude, insulting to others, hateful, off-topic or reckless to the community. See our full terms of use here.

More in News

A 60-year-old Faribault man was killed Thursday evening when his car collided with a semitrailer in Rice County. The Minnesota State Patrol reported that Randy J. Hansen was driving a 1995 Pontiac Grand Am southbound on Highway 21 and making a left turn to continue eastbound on 21 shortly after 5:30 p.m. when his car collided with a semi going...

Transit for Liveable Communities and St. Paul Smart Trips are merging Jan. 1 to create a new nonprofit organization to promote buses, trains, bikes, car sharing, walking and other alternatives to putting more cars on the road.

DULUTH, Minn. — A Roanoke, Va., multimillionaire who made his fortune in health care and has recently purchased coal mines wants to buy the bankrupt Magnetation LLC operations on Minnesota’s Iron Range and put laid-off employees back to work. That’s the plan of Tom Clarke, owner of ERP Compliant Fuels and now ERP Iron Ore, who has brokered a deal...

Renaldo Terez McDaniel was looking under the hood of his car outside a St. Paul auto-parts store on a summer evening last June when three shots were fired. One hit the 31-year-old McDaniel in the shoulder, another pierced his stomach. The third struck his head.

Delta Air Lines is rolling out new free snacks for customers in the main cabin, including brand-name yogurt bars and pretzels. Some will come in larger portions than before because, Delta has figured out, that’s what customers crave.

MADISON, Wis. — University of Wisconsin System officials Thursday approved raising tuition for out-of-state, graduate and professional school students by hundreds of dollars at more than a half-dozen campuses as they grapple with a Republican-imposed freeze on in-state undergraduate tuition. The plan calls for increases at UW-Eau Clare, UW-Green Bay, UW-La Crosse, UW-Madison, UW-Milwaukee, UW-Stout and all the system’s two-year...